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Income Taxes - Narrative (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013
Income Tax Disclosure [Line Items] |  |  |
(Benefit from) provision for income taxes | $ 42,000 | $ (253,000) |
Accrued interest and penalties | 2,700,000 |  | 2,600,000
Limit on operating loss carryforwards and recognition | 11,400,000 |  |
Limit on operating loss carryforwards and recognition, tax-effected | 4,000,000 |  |
Valuation allowance | (489,030,000) |  | (487,300,000)
Deferred Tax Assets, Gross | 548,620,000 |  |
Deferred Tax Liabilities, Net | (54,257,000) |  |
Deferred Tax Assets, Net of Valuation Allowance | 494,363,000 |  |
Deferred Tax Assets, Net | 5,333,000 |  |
Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Limit on operating loss carryforwards and recognition | 405,900,000 |  |
Limit on operating loss carryforwards and recognition, tax-effected | 443,400,000 |  |
Certain Components Likely To Be Subject To Annual Limitation [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred Tax Assets, Gross | 88,437,000 |  |
Certain Components Likely To Be Subject To Annual Limitation [Member] | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred Tax Assets, Net | 88,400,000 |  |
Certain Components Likely To Be Subject To Annual Limitation [Member] | Minimum [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred Tax Assets, Net | 50,900,000 |  |
Subject To Annual Limitation [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred Tax Assets, Gross | 98,232,000 |  |
Generally Not Subject to Annual Limitation [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred Tax Assets, Gross | $ 361,951,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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